# GL-MT6000 (Flint 2) Multiwan failover mode (guest subnet conflict)

**URL:** <https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-guest-subnet-conflict/60258>\
**Category:** Router\
**Created:** [June 25, 2025, 1:34am UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-guest-subnet-conflict/60258 "2025-06-25T01:34:28Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Rivo](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/r/59ef9b/32.png) [@Rivo](https://forum.gl-inet.com/u/Rivo)\
**Post date:** [June 25, 2025, 1:34am UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-guest-subnet-conflict/60258/1 "2025-06-25T01:34:28Z")

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My Flint 2 runs fine. Usual business: routing the Internet from ISP, getting 192.168.0.10 from ISP's modem DHCP and serving local network under 192.168.8.0/24.

Unfortunately, there are problems with ISP so in the meantime I switched back on an old B535-333 4G router and plugged it to Ethernet 2 (switched from LAN to WAN in Network port management -\> the manual needs to be updated). The 4G router gives 192.168.9.101 to eth2.  
ISP's modem is still plugged to Ethernet 1 so that it takes over when ISP sorts out their mess.

I made sure the 4G router"s WAN port is pingable so the Flint 2 can see it. Then, I thought it would be enough to enable Multiwan failover mode and everything would be fine but it would have been too easy.

Too bad, I now get the following error

> Guest subnet is in conflict with the WAN subnet, Please Change Guest Subnet to a different address.

on Ethernet 2's tab.

Any clue on what I do wrong here?

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**Author:** ![bruce](https://forum-assets.gl-inet.com/user_avatar/forum.gl-inet.com/bruce/32/35649_2.png) [@bruce](https://forum.gl-inet.com/u/bruce)\
**Post date:** [June 25, 2025, 2:35am UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-guest-subnet-conflict/60258/2 "2025-06-25T02:35:55Z")

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Change the Gateway of Guest Network to 192.168.10.1

> [@Rivo](#):
>
> Guest subnet is in conflict with the WAN subnet, Please Change Guest Subnet to a different address. on Ethernet 2's tab.

 ![Bruce_2025-06-25_10-34-50](https://forum-static.gl-inet.com/original/3X/8/4/84e1690f083c8b911da7a1cd5c2861a4ab677c6c.png)

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**Author:** ![Rivo](https://forum-assets.gl-inet.com/letter_avatar_proxy/v4/letter/r/59ef9b/32.png) [@Rivo](https://forum.gl-inet.com/u/Rivo)\
**Post date:** [June 25, 2025, 8:06am UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-guest-subnet-conflict/60258/4 "2025-06-25T08:06:13Z")

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Thank you. I found out yesterday. I just changed the 4G router's default 192.168.8/255 to 192.168.9/255. I didn't remember that the guest network was also on 192.168.9.1. My solution was to move the 4G router's default network but yours is fine too.

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**Author:** ![system](https://forum-static.gl-inet.com/original/3X/7/7/77e28f6cb342ac4bd641bd9a6254595d61b2812a.png) [@system](https://forum.gl-inet.com/u/system)\
**Post date:** [December 27, 2025, 11:27am UTC](https://forum.gl-inet.com/t/gl-mt6000-flint-2-multiwan-failover-mode-guest-subnet-conflict/60258/6 "2025-12-27T11:27:48Z")

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